aMember database customizations

Hi All,
I'm looking for a bit of help to do some customization to an install of aMember V3. I understand what has to be done, but implementing it is a little over my head.
I'll try to be as clear as possible.
For Who:
I am working on a site that uses aMember to control access to their servers for a specific amount of time dictated by which 'product' you select.

The Jist:
For each product subscription, there is a start date and an end date already set up via custom fields.
There are around 100 products and 3 'types' of products. The 'products' need to be grouped by 'type'. Which i assume will be done by adding a 'product_type' column in the products table. I would also assume that there would need to be another column in the members table that associates a member's product with it's product type. But with a fancy SQL statement..maybe not ; )

Once the new columns are in place and populated, this is what needs to happen:
The start/end dates need to be pulled from the database for each product type that has an active subscription. Those dates will be sent to php arrays that i will send to a jquery datepicker that i already have set up, they will disable the dates in the datepicker.

The product types are:
15 nodes
30 nodes
45 nodes

These product types all have a number in their 'type' name. We can only run a max of 45 nodes per day. So if any combination of these types running per day add up to 45, we need to black out the day in the datepicker.
So basically, dont pull the dates from the database if the product types with active subscriptions do not add up to 45.
Of course, I can go into more detail once we enter into negotiation.
Let me know if this is something you would be interested in tackling. We can go over payment details through email.
Thanks and looking forward to a response!
Dennis